If your having trouble with any specific Bucket List Challenge, I've made a Youtube playlist of all 30 Bucket Lists being completed for those who like videos.
Heres the link to the playlist:https://www.youtube.com/playlist?list=PLvrkjkOmqksrr3fs5vhwb...
Just pick which one you are struggling with and follow the video, hints are in the video descriptions.
Hope this helps!
[Edit]: There's been multiple reports of #19 not working for people using MPH, if this is happening to you try changing your "Units" in the settings menu to "Metric" (KPH).